* only tabcomplete for commands the sender has permission for
* set permission defaults for spigot
* Make velocity autocomplete on arg length 0 and 1
* fix advancements perm in spigot plugin.yml and add settings perm
(whoops)
* don't show bedrock commands to java players
* modify spigot perm defaults
* censor help menu, abstract tab complete code
* Bedrock players don't get cmd argument suggestions
* update spigot plugin.yml
* Introduce CommandSender.getLocale()
This allows Geyser-specific commands (e.g. `/geyser help`) to be displayed in the (Java or Bedrock) player's default language, which stops those commands from simply being displayed in the default locale.
* Tweak Javadoc
* Set CommandManager's GeyserConnector to final
* Clean up